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Make projection matrix members mutable #467

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Make projection matrix members mutable #467

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7 changes: 5 additions & 2 deletions en/Building_a_Simple_Engine/Engine_Architecture/03_component_systems.adoc
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Original file line number Diff line number Diff line change
Expand Up @@ -226,8 +226,11 @@ private:
float farPlane = 1000.0f;

glm::mat4 viewMatrix = glm::mat4(1.0f);
glm::mat4 projectionMatrix = glm::mat4(1.0f);
bool projectionDirty = true;
// mutable: GetProjectionMatrix() is logically const (it just returns a
// matrix) even though it lazily recomputes and caches that matrix on
// first access after the projection parameters change.
mutable glm::mat4 projectionMatrix = glm::mat4(1.0f);
mutable bool projectionDirty = true;

public:
void SetPerspective(float fov, float aspect, float near, float far) {
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